Mixer for cement



April 8, 1930. J. M. OWEN MIXER FOR CEMENT Filed April 25, 1928 A TTORN E YJ Patented Apr. 8, 1930 JACK M. OWEN, OF LONG BEACH, CALIFORNIA MIXER FOR CEMENT Application filed April 25, 1928. Serial No. 272,748.

The present invention relates to a mixer for plastic material, such as cement or concrete. It appertains more particularly to mechanical mixer.

In the cementing of oil wells, it is necessary to provide a mixer which'is portable. It is desirable that such a mixer have the following qualities: It must be capable of being started quickly, and deliver a uniform mix continuously. It is furthermore desirable to provide for adjustment of the quan-' tit-y delivered. Another desired quality is a machine of large capacity, capable of receiving at its inlet end, dry cement as fast as it can be dumped therein, and to deliver the same without choking or clogging. The objects of this invention are to provide a mixer having any or all of the above mentioned characteristics.

These objects are obtained by means of the embodiment of my invention illustrated in the accompanying drawings, in which Fig. 1 is a side elevation of my mixer with parts broken away to show the interior construct-ion; and Fig. 2 is an end view thereof.

Referring with more particularity to the drawing, the mixer comprises a horizontally disposed barrel 3 closed at the ends by heads 4 and 5 provided with bearings for a shaft. At one end of the barrel is a hopper 6, and at the other end is a delivery chute 7. The barrel is supported by suitable feet 8.

Within the barrel and mounted in the bearings at the ends is a shaft 9 having secured to the end thereof a drive wheel 10, in this instance shown as a sprocket wheel which may be geared by a chain 11 to any suitable driving means. Mounted upon the shaft 9 and extending along the hopper opening in the barrel is a screw flight 12, providing with the barrel a screw pump. There is formed in the barrel 3 two zones or chambers, one a conveyor chamber in which the screw flight 12 is disposed and the other a mixing chamber. In the mixing chamber and secured to the shaft 9 are mixing arms or paddles 13. Opening into the inlet end of the mixing zone is a water pipe 14.

The mixer operates in the following manner: Dry cement indicated by C is dumped into the hopper, while the shaft 9 is rotated. The hopper is kept filled or partially filled, thereby filling the spaces between the flight of the screw, and closing the ends of the mixing chamber. Water is introduced through the pipe 14 into the mixing chamber and the paddles 13 cause a thorough mix of the same. These paddles have faces pitched so that they tend to move the material being mixed toward the outlet 7 from whence it may be delivered into a suction box or other receptacle. It will be noted that by reason of the character of the conveyor chamber, the passage of water from the mixing chamber is prevented, the cement acting as a head for the mixing chamber, which head continually advances and dissolves. There is a continuous movement of dry cement into the mixing chamber, which cement acts as a head, and at no time during its operation will water have an opportunity to pass back wardly into the hopper orto penetrate the cement to an appreciable extent in the conveyor chamber. The continuous movement of the cement is rendered positive by means of the water entering the inlet 14, inasmuch as this water washes away the cement adjacent the Water inlet as well as that adjacent the screw conveyor. Adjustment of the amount of mix may be made by adjusting the speed of the shaft and the amount of water introduced. Having established a speed and a water supply, it is only necessary to keep the hopper full of dry cement. The mixer is compact and has no parts subject to clogging. or choking. The feed is positive, and the delivery will be uniform. The mixer is of a character such that'it may be moved about upon trucks, and quickly installed in position for operation.

What I claim is 1. A mixer for cement comprising a barrel, screw means for feeding the cement through a portion of the length of the barrel in a column occupying the full bore of the barrel, means for directing a stream of water across the said bore substantially at the end of the feeding means to cause the water to Wash'cement from a point adjacent the end of the screw means and to mix with the day of April, 1928.

c for picking up cement as the latter leaves the screw means, and means for mixing the cement and water and feeding it through the remainder of the barrel to a discharge opening in the latter.

2. A mixer for cement comprising a bar= rel, a screw conveyor for feeding the cement through a port-ion of the length of the barrel in a column occupying the full bore of the latter, means for directing a stream of water across the bore substantially at the end of the screw conveyor to cause the water to wash cement from a point adjacent the end of the conveyor and to mix with the cement as the latter leaves the said conveyor,

and two opposed spiral series of blades for mixing the cement and water and feeding it through the remainder of the barrel to a discharge opening in the latter.

3. A mixer for cement comprising a barrel having a bore of uniform diameter throughout its length, an open mouthed feeding hopper adjacent one end of the barrel and communicating with the bore thereof, a discharge adjacent the other end of the barrel, screw means for feeding the cement from the mouth of the hopper through a portion of the-barrel in a column occupying the full bore of the barrel, means for directing a stream of water across the said bore at the end of the feeding means to cause the water to wash cement from a point adjacent the end of the screw means and to mix with the cement as the latter leaves the screw means, and means for picking up the material directly after it is supplied with water and mixing the water and cement together as they are fed to the discharge.

4. A mixer for cement comprising a barrel having a bore of uniform diameter throughout its length, an open mouthed feeding hopper adjacent one end of the barrel and communicating with the bore thereof, a discharge adjacent the other end of the barrel, a screw conveyor positioned within the barrel and projecting beyond opposite sides of the hopper mouth for feeding the cement from the latter through a portion of the barrel in a column occupying the full bore of the latter, means for directing a stream of water across the said bore at the discharge end of the screw conveyor for causing the water to wash cement from a point adjacent the end of the conveyor and to mix with the cement as it leaves the screw conveyor, and two opposed spiral series of blades the cement directly after it is supplied with water and mixing the two together as they are fed to the discharge.

In witness that I claim the foregoing I have hereunto subscribed my name this 16th J AGK M. OWEN. 

